Migrate `IconButton` to Material 3 - Part 2 (#106437)

dev/tools/gen_defaults/lib/icon_button_template.dart

@@ -35,12 +35,26 @@ class _TokenDefaultsM3 extends ButtonStyle {
       if (states.contains(MaterialState.disabled)) {
         return ${componentColor('md.comp.icon-button.disabled.icon')};
       }
+      if (states.contains(MaterialState.selected)) {
+        return ${componentColor('md.comp.icon-button.selected.icon')};
+      }
       return ${componentColor('md.comp.icon-button.unselected.icon')};
     });
 
  @override
   MaterialStateProperty<Color?>? get overlayColor =>
     MaterialStateProperty.resolveWith((Set<MaterialState> states) {
+      if (states.contains(MaterialState.selected)) {
+        if (states.contains(MaterialState.hovered)) {
+          return ${componentColor('md.comp.icon-button.selected.hover.state-layer')};
+        }
+        if (states.contains(MaterialState.focused)) {
+          return ${componentColor('md.comp.icon-button.selected.focus.state-layer')};
+        }
+        if (states.contains(MaterialState.pressed)) {
+          return ${componentColor('md.comp.icon-button.selected.pressed.state-layer')};
+        }
+      }
       if (states.contains(MaterialState.hovered)) {
         return ${componentColor('md.comp.icon-button.unselected.hover.state-layer')};
       }

examples/api/lib/material/icon_button/icon_button.3.dart

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flutter code sample for IconButton with toggle feature
+
+import 'package:flutter/material.dart';
+
+void main() {
+  runApp(const IconButtonToggleApp());
+}
+
+class IconButtonToggleApp extends StatelessWidget {
+  const IconButtonToggleApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      theme: ThemeData(
+        colorSchemeSeed: const Color(0xff6750a4),
+        useMaterial3: true,
+        // Desktop and web platforms have a compact visual density by default.
+        // To see buttons with circular background on desktop/web, the "visualDensity"
+        // needs to be set to "VisualDensity.standard".
+        visualDensity: VisualDensity.standard,
+      ),
+      title: 'Icon Button Types',
+      home: const Scaffold(
+        body: DemoIconToggleButtons(),
+      ),
+    );
+  }
+}
+
+class DemoIconToggleButtons extends StatefulWidget {
+  const DemoIconToggleButtons({super.key});
+
+  @override
+  State<DemoIconToggleButtons> createState() => _DemoIconToggleButtonsState();
+}
+
+class _DemoIconToggleButtonsState extends State<DemoIconToggleButtons> {
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.all(8.0),
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+        children: <Widget>[
+          Row(
+            mainAxisAlignment: MainAxisAlignment.center,
+            // Standard IconButton
+            children: const <Widget>[
+              DemoIconToggleButton(isEnabled: true),
+              SizedBox(width: 10),
+              DemoIconToggleButton(isEnabled: false),
+            ]
+          ),
+          Row(
+            mainAxisAlignment: MainAxisAlignment.center,
+            children: const <Widget>[
+              // Filled IconButton
+              DemoIconToggleButton(isEnabled: true, getDefaultStyle: enabledFilledButtonStyle,),
+              SizedBox(width: 10),
+              DemoIconToggleButton(isEnabled: false, getDefaultStyle: disabledFilledButtonStyle,)
+            ]
+          ),
+          Row(
+            mainAxisAlignment: MainAxisAlignment.center,
+            children: const <Widget>[
+              // Filled Tonal IconButton
+              DemoIconToggleButton(isEnabled: true, getDefaultStyle: enabledFilledTonalButtonStyle,),
+              SizedBox(width: 10),
+              DemoIconToggleButton(isEnabled: false, getDefaultStyle: disabledFilledTonalButtonStyle,),
+            ]
+          ),
+          Row(
+            mainAxisAlignment: MainAxisAlignment.center,
+            children: const <Widget>[
+              // Outlined IconButton
+              DemoIconToggleButton(isEnabled: true, getDefaultStyle: enabledOutlinedButtonStyle,),
+              SizedBox(width: 10),
+              DemoIconToggleButton(isEnabled: false, getDefaultStyle: disabledOutlinedButtonStyle,),
+            ]
+          ),
+        ]
+      ),
+    );
+  }
+}
+
+class DemoIconToggleButton extends StatefulWidget {
+  const DemoIconToggleButton({required this.isEnabled, this.getDefaultStyle, super.key});
+
+  final bool isEnabled;
+  final ButtonStyle? Function(bool, ColorScheme)? getDefaultStyle;
+
+  @override
+  State<DemoIconToggleButton> createState() => _DemoIconToggleButtonState();
+}
+
+class _DemoIconToggleButtonState extends State<DemoIconToggleButton> {
+  bool selected = false;
+
+  @override
+  Widget build(BuildContext context) {
+    final ColorScheme colors = Theme.of(context).colorScheme;
+    final VoidCallback? onPressed = widget.isEnabled
+      ? () {
+        setState(() {
+          selected = !selected;
+        });
+      }
+      : null;
+    ButtonStyle? style;
+    if (widget.getDefaultStyle != null) {
+      style = widget.getDefaultStyle!(selected, colors);
+    }
+
+    return IconButton(
+      isSelected: selected,
+      icon: const Icon(Icons.settings_outlined),
+      selectedIcon: const Icon(Icons.settings),
+      onPressed: onPressed,
+      style: style,
+    );
+  }
+}
+
+ButtonStyle enabledFilledButtonStyle(bool selected, ColorScheme colors) {
+  return IconButton.styleFrom(
+    foregroundColor: selected ? colors.onPrimary : colors.primary,
+    backgroundColor: selected ? colors.primary : colors.surfaceVariant,
+    disabledForegroundColor: colors.onSurface.withOpacity(0.38),
+    disabledBackgroundColor: colors.onSurface.withOpacity(0.12),
+    hoverColor: selected ? colors.onPrimary.withOpacity(0.08) : colors.primary.withOpacity(0.08),
+    focusColor: selected ? colors.onPrimary.withOpacity(0.12) : colors.primary.withOpacity(0.12),
+    highlightColor: selected ? colors.onPrimary.withOpacity(0.12) : colors.primary.withOpacity(0.12),
+  );
+}
+
+ButtonStyle disabledFilledButtonStyle(bool selected, ColorScheme colors) {
+  return IconButton.styleFrom(
+    disabledForegroundColor: colors.onSurface.withOpacity(0.38),
+    disabledBackgroundColor: colors.onSurface.withOpacity(0.12),
+  );
+}
+
+ButtonStyle enabledFilledTonalButtonStyle(bool selected, ColorScheme colors) {
+  return IconButton.styleFrom(
+    foregroundColor: selected ? colors.onSecondaryContainer : colors.onSurfaceVariant,
+    backgroundColor: selected ?  colors.secondaryContainer : colors.surfaceVariant,
+    hoverColor: selected ? colors.onSecondaryContainer.withOpacity(0.08) : colors.onSurfaceVariant.withOpacity(0.08),
+    focusColor: selected ? colors.onSecondaryContainer.withOpacity(0.12) : colors.onSurfaceVariant.withOpacity(0.12),
+    highlightColor: selected ? colors.onSecondaryContainer.withOpacity(0.12) : colors.onSurfaceVariant.withOpacity(0.12),
+  );
+}
+
+ButtonStyle disabledFilledTonalButtonStyle(bool selected, ColorScheme colors) {
+  return IconButton.styleFrom(
+    disabledForegroundColor: colors.onSurface.withOpacity(0.38),
+    disabledBackgroundColor: colors.onSurface.withOpacity(0.12),
+  );
+}
+
+ButtonStyle enabledOutlinedButtonStyle(bool selected, ColorScheme colors) {
+  return IconButton.styleFrom(
+    backgroundColor: selected ? colors.inverseSurface : null,
+    hoverColor: selected ? colors.onInverseSurface.withOpacity(0.08) : colors.onSurfaceVariant.withOpacity(0.08),
+    focusColor: selected ? colors.onInverseSurface.withOpacity(0.12) : colors.onSurfaceVariant.withOpacity(0.12),
+    highlightColor: selected ? colors.onInverseSurface.withOpacity(0.12) : colors.onSurface.withOpacity(0.12),
+    side: BorderSide(color: colors.outline),
+  ).copyWith(
+    foregroundColor: MaterialStateProperty.resolveWith((Set<MaterialState> states) {
+      if (states.contains(MaterialState.selected)) {
+        return colors.onInverseSurface;
+      }
+      if (states.contains(MaterialState.pressed)) {
+        return colors.onSurface;
+      }
+      return null;
+    }),
+  );
+}
+
+ButtonStyle disabledOutlinedButtonStyle(bool selected, ColorScheme colors) {
+  return IconButton.styleFrom(
+    disabledForegroundColor: colors.onSurface.withOpacity(0.38),
+    disabledBackgroundColor: selected ? colors.onSurface.withOpacity(0.12) : null,
+    side: selected ? null : BorderSide(color: colors.outline.withOpacity(0.12)),
+  );
+}